Guide for the mandrel shafts in tube drawing benches



p 7 1932- H. HEETKAMP 1,879,743

GUIDE FOR THE MANDREL SHAFT IN TUBE DRAWING BENCHES Filed April 25, 1930 y A 5. aw

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Patented Sept. 27, 1932 UNITED sTATas PATENT OFFICE HEINRICH HEETKAMP, OF DUISIBUBG, GERMANY, ASSIGNOB TO DIE-MAG .AIK'IIENGE- SELLSCHAFT, OF DUISIBURQ, GERMANY l GUIDE FOR THE MANDREL' SHAITS IN TUBE DRAWING IBENGHES Application filed April 25, 1930, Serial No. 447,299, and in Germany February 17, 1980.

Tube drawing benches for the production of tubes of different diameters must be constructed so that the shaft of the mandrel and its guide are interchangeable.-

According to the invention the guide for the shaft is formed as a tubular body which is longitudinall slotted. The longitudinal slot acts as a guide-way for the carrier on the driving means (rack or the like), which carrier extends into the tube. \Vhen interchanging the shaft of the mandrel and its guide, the tubular body which acts as the guide is lifted out and re-inserted as a whole with the mandrel shaft enclosed therein. The tubular guide may conveniently bemade from a plurality of pieces of tube which are adapted to be suspended from a crane'hook when the shaft guide and the mandrel are being interchanged. I

The invention is diagrammatically illustrated by way of example in the accompanyin%drawing in which igure 1 is a plan of the tube drawing bench and fFigure 2 is a sectional side elevation there- Figure 3 shows the crane suspension tackle employed and Figure 4 is an end elevation thereof.

Figures 5 and 6 show details of the invention.

The guide-bed 1 for the mandrel shaft is assembled with the draw-rin'g-bed 2 in known manner. A tube 6 having a longitudinally extending slot in the underside serves as a guide for the mandrel shaft 4. In the constructional example shown, the, tube is sub-divided, the abutting edges of the several pieces resting in bearings 7 which arefitted in the guide-bed from above (Figure 5).

By means of the lateral projections 8 the bearings rest on shoulders 9 of the angular holdinv members 10, which engage over the guide-bed. The slot 11 in the tube guide serves for the passage of the carrier mounted on the rack 12. The cross slides 13 (see particularly Figures'5 and 6) are provided with clamping screws 19 by the aid of which the bearings 7 are firml held in the operative po- 5 sitlon. On both sidesof and above the bearings 7 are'provided eyes 14 for the hooks or the like 15 on the suspension bar 16. The suspension-bar 16 is suspended from the crane hook 17. A mechanism 18 (Figure 1) drives the rack 12.

To interchange the mandrel shaft guide and the mandrel, the clamping screws 19 are loosened and the slides 13 which carry them are moved back and the hooks 15 hooked into the eyes 14 in the bearings 7. The guide formed of the pieces of tube together with the mandrel shaft carried therein can be lifted out of the guide bed of the bench and another guide with a corresponding mandrel inserted comprising a tubular guide for the mandrel shaft, an axially movable mandrel shaft therein, means for locking said tubular guide in position in said bench when introduced from above and means for moving said tubular guide together with said mandrel shaft into and out of the bench when said locking means are inoperative, consisting of a member co-extensive with said tubular guide for suspension from a crane and a plurality of depending elements on said member for engagin said guide.

2. u tube drawin benches accordin to claim 1, a tubular guidemember in sections that are disposed in alignment and with their ends abutting, bearing blocks within which the abutting ends of the sections of the tubular guide are received and which are disposed in the bench, the said bearing blocks eing provided with lift eyes and being held in their operative position by the locking means, said locking means comprising slide members carrying clamping screws.

HEINRICH H EETKAMP. 

